You’ve opened a support topic and you were rightly given support by Mark. If you do not want help and instead want to request a feature, you ought to be posting in the “Requests and Features” forum so that you don’t waste our volutneers’ time. I’ve moved your thread for now.

The problem isn’t webp support in WordPress, but webp support in the underlying libraries.

WordPress is built in PHP, atop the various PHP extensions. Format support for images is handled by the underlying code, namely either the GD library or the ImageMagick library.

When the PHP versions start to get updated (and you’ll note that WordPress is working along these lines already) then the newer versions of these libraries and PHP have support for the webp format, then it can be added to WordPress.